J/A+A/565/A7 Transit observations of the super-Earth GJ1214b (Caceres+, 2014)
Ground-based transit observations of the super-Earth GJ1214b.
Caceres C., Kabath P., Hoyer S., Ivanov V.D., Rojo P., Girard J.H.,
Miller-Ricci Kempton E., Fortney J.J., Minniti D.
<Astron. Astrophys. 565, A7 (2014)>
=2014A&A...565A...7C 2014A&A...565A...7C
ADC_Keywords: Stars, double and multiple ; Planets; Photometry
Keywords: planetary systems - techniques: photometric -
techniques: spectroscopic - planets and satellites: atmospheres -
stars: individual: GJ 1214
Abstract:
GJ 1214b is one of the few known transiting super-Earth-sized
exoplanets with a measured mass and radius. It orbits an M-dwarf, only
14.55pc away, making it a favorable candidate for follow-up studies.
However, the composition of GJ 1214b's mysterious atmosphere has yet
to be fully unveiled. Our goal is to distinguish between the various
proposed atmospheric models to explain the properties of GJ 1214b:
hydrogen-rich or hydrogen-He mix, or a heavy molecular weight
atmosphere with reflecting high clouds, as latest studies have
suggested. Wavelength-dependent planetary radii measurements from the
transit depths in the optical/NIR are the best tool to investigate the
atmosphere of GJ 1214b. We present here (i) photometric transit
observations with a narrow-band filter centered on 2.14-microns and a
broad-band I-Bessel filter centered on 0.8665-microns, and (ii)
transmission spectroscopy in the H and K atmospheric windows that
cover three transits. The obtained photometric and spectrophotometric
time series were analyzed with MCMC simulations to measure the
planetary radii as a function of wavelength. We determined radii
ratios of 0.1173 for I-Bessel and 0.11735 at 2.14-microns. Our
measurements indicate a flat transmission spectrum, in agreement with
last atmospheric models that favor featureless spectra with clouds and
high molecular weight compositions.
Description:
Files contain data points from the obtained light curves of the
transiting planet GJ 1214b we obtained with the SOI (in the I-Bessel
filter) and OSIRIS (with a narrow-band filter centered on 2.14um)
instruments at the SOAR telescope. They include the BJD of
observation, the measured flux, and the photometric error estimation.
Objects:
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RA (2000) DE Designation(s)
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17 15 18.94 +04 57 49.7 GJ 1214b = GJ 1214b
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
phot1.dat 30 1466 Photometry obtained with SOI (with I-Bessel filter)
phot2.dat 30 1030 Photometry obtained with OSIRIS (with a 2.14um
narrow-band filter)
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See also:
J/A+A/549/A10 : Transits of GJ 1214 (Harpsoe+, 2013)
Byte-by-byte Description of file: phot1.dat phot2.dat
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Bytes Format Units Label Explanations
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1- 16 F16.8 d BJD Time of observation (TDB)
18- 23 F6.4 --- Flux Normalized flux
25- 30 F6.4 --- e_Flux Error in normalized flux
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Acknowledgements:
Claudio Caceres, ccaceres(at)dfa.uv.cl
(End) C. Caceres [Univ. de Valparaiso, Chile], P. Vannier [CDS] 13-Mar-2014